(svn r4493) Newgrf : Action 04. Beginning of implementation.

Some TODOs left, but the core is there.
Thanks to Peter1138 for code, advice and patience
And to Patchman for letting us define a lot of langids :)

Makefile

@@ -638,6 +638,7 @@ SRCS += newgrf.c
 SRCS += newgrf_engine.c
 SRCS += newgrf_spritegroup.c
 SRCS += newgrf_station.c
+SRCS += newgrf_text.c
 SRCS += news_gui.c
 SRCS += npf.c
 SRCS += oldloader.c